Intergranular corrosion test in Zhejiang
Rong Da detection Co., Ltd. contact: Mr. Wang
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Intergranular corrosion: corrosion intercrystalline; corrosion intergranular
A metal, grain boundary is very active, in the vicinity of the grain boundary or local corrosion, and the corrosion of the grain is relatively small, which is intergranular corrosion. Intergranular corrosion makes the metal fracture (grain), and at the same time, the loss of strength of the metal. Intergranular corrosion is caused by the increase or decrease of the alloying elements in the grain boundary or in the region of the grain boundaries.
Explanation: mainly due to the difference of the chemical composition between the surface and the inside of the grain and the existence of the grain boundary impurity or internal stress. The combination of intergranular corrosion and intergranular failure greatly reduces the mechanical strength of the metal. But after the occurrence of surface corrosion of metals and alloys still maintain certain metallic luster, do not see signs of destruction, but the binding force between grains significantly weakened, poor mechanical properties, can not withstand the strike, so it is a very dangerous corrosion. Usually occurs in brass, aluminium alloy and stainless steel, nickel base alloy.
Standard for intergranular corrosion test
Stainless steel intergranular corrosion test: A 262-2014 GB/T4334-2008 ASTM ISO 3651-2:1998 ASTM A763-93 (R2009)
Corrosion resistance of calcined high nickel chromium bearing alloy intergranular inspection testing method using the method of A:ASTM G28-02 (2008)
Test of intergranular corrosion susceptibility of stainless steel pressure vessels: GB/T21433-2008
Ni based alloy intergranular corrosion A method: 15260-1994 GB/T
Corrosion resistance of calcined high nickel chromium bearing alloy intergranular inspection testing method using the method of A:ASTM G28-02 (2008)
Standard Test Method for intergranular corrosion of 5XXX series aluminum alloys - mass loss method: 26491-2011 GB/T
Method for determination of intergranular corrosion of aluminium alloys: 7998-2005 GB/T
The intergranular corrosion of heat treated aluminum alloy was evaluated by immersion in sodium chloride solution and hydrogen peroxide solution: G110-1992 ASTM (2009).
Evaluation of the nickel content in the boiling acidification Sodium Chloride Solution G123-2000 ASTM (2011